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參數(shù)資料
| 型號： | SYM53C180 |
| 廠商： | LSI Corporation |
| 英文描述： | Ultra3 SCSI Bus Expander(Ultra2 SCSI總線擴(kuò)展器) |
| 中文描述： | 個Ultra3 SCSI總線擴(kuò)展（Ultra2的SCSI總線擴(kuò)展器） |
| 文件頁數(shù)： | 21/78頁 |
| 文件大?。?/td> | 1073K |
| 代理商： | SYM53C180 |
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Interface Signal Descriptions
2-3
2.1.1.1 SYM53C180 Requirements for Synchronous Negotiation
The SYM53C180 builds a table of information regarding devices on the
bus in on-chip RAM. The PPR, SDTR, and WDTR information for each
device is taken from the MSG bytes during negotiation. For all devices
in the configuration to communicate accurately through the SYM53C180
at Ultra3 (Fast 80) rates, it is necessary for a complete synchronous
negotiation to take place between the initiator and target(s) prior to any
data transfer. On a 16-bit bus, the SYM53C180 at Ultra3 approaches
rates of 160 Mbytes/s. The SYM53C180 defaults to Fast 20 rates when
a valid negotiation between the initiator and target has not occurred.
2.1.1.2 TolerANT Technology
In Single-Ended (SE) mode, the SYM53C180 features TolerANT
technology, which includes active negation on the SCSI drivers and input
signal filtering on the SCSI receivers. Active negation causes the SCSI
Request, Acknowledge, Data, and Parity signals to be actively driven
HIGH rather than passively pulled up by terminators.
TolerANT receiver technology improves data integrity in unreliable
cabling environments, where other devices would be subject to data
corruption. TolerANT receivers filter the SCSI bus signals to eliminate
unwanted transitions without the long signal delays associated with RC-
type input filters. This improved driver and receiver technology helps
eliminate double clocking of data, the single biggest reliability issue with
SCSI operations.
The benefits of TolerANT technology include increased immunity to noise
on the deasserting signal edge, better performance due to balanced duty
cycles, and improved SCSI transfer rates. In addition, TolerANT SCSI
devices prevent glitches on the SCSI bus at power-up or power-down,
so other devices on the bus are also protected from data corruption.
2.1.1.3 LVD Link Technology
To support greater device connectivity and longer SCSI cables, the
SYM53C180 features LVD Link technology, the LSI Logic implementation
of multimode LVD SCSI. LVD Link transceivers provide the inherent
reliability of differential SCSI, and a long-term migration path of faster
SCSI transfer rates.
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